A laboratory investigation has been carried out to reveal the mechanism of recrystallization texture formation in an interstitial free (IF) steel, based on the assumption that the reduced grain boundary constraint for a grain rotation during cold-rolling plays an important role on the mechanism. As a parameter of grain boundary constraint, the ratio of deformation strengths of grain boundary area and grain matrix were varied by changing the cold-rolling temperature (–100–200°C) and microalloying of boron into IF steel. The paper revealed that the reduced grain boundary constraint by scavenging the interstitial elements from grain boundaries not only enhanced a development of γ-fiber texture but also suppressed a formation of deformation bands inside the γ-fiber matirix during cold-rolling in IF-steel. In-situ like recrystallization from the strong {111}<112> γ-fiber texture, which is caused by a reduction of nucleation frequency of <110>//ND grains from deformation bands, is the origin of the strong {111}<112> γ-fiber recrystallization texture formation in IF steel.